//=========
// Author:  Alex Reynolds & Shane Neph
// Project: starch
// File:    starchSha1Digest.c
//=========

/* sha1.c - Functions to compute SHA1 message digest of files or
   memory blocks according to the NIST specification FIPS-180-1.

   Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2008 Free Software
   Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Scott G. Miller
   Credits:
      Robert Klep <robert@ilse.nl>  -- Expansion function fix
*/

#ifdef __cplusplus
#include <cstddef>
#include <cstring>
#else
#include <stddef.h>
#include <string.h>
#endif

#include "data/starch/starchSha1Digest.h"

#ifdef __cplusplus
extern "C" {
#endif

struct offset_test { char c; sha1_uint32 x; };

#ifdef WORDS_BIGENDIAN
# define SWAP(n) (n)
#else
# define SWAP(n) \
    (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
#endif

#define BLOCKSIZE 4096
#if BLOCKSIZE % 64 != 0
# error "invalid BLOCKSIZE"
#endif

/* This array contains the bytes used to pad the buffer to the next
   64-byte boundary.  (RFC 1321, 3.1: Step 1)  */
static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */ };


/* Take a pointer to a 160 bit block of data (five 32 bit ints) and
   initialize it to the start constants of the SHA1 algorithm.  This
   must be called before using hash in the call to sha1_hash.  */
void
sha1_init_ctx (struct sha1_ctx *ctx)
{
  ctx->A = 0x67452301;
  ctx->B = 0xefcdab89;
  ctx->C = 0x98badcfe;
  ctx->D = 0x10325476;
  ctx->E = 0xc3d2e1f0;

  ctx->total[0] = ctx->total[1] = 0;
  ctx->buflen = 0;
}

/* Put result from CTX in first 20 bytes following RESBUF.  The result
   must be in little endian byte order.

   IMPORTANT: On some systems it is required that RESBUF is correctly
   aligned for a 32-bit value.  */
void *
sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
{
#ifdef __cplusplus
    (reinterpret_cast<sha1_uint32 *>( resbuf ))[0] = SWAP (ctx->A);
    (reinterpret_cast<sha1_uint32 *>( resbuf ))[1] = SWAP (ctx->B);
    (reinterpret_cast<sha1_uint32 *>( resbuf ))[2] = SWAP (ctx->C);
    (reinterpret_cast<sha1_uint32 *>( resbuf ))[3] = SWAP (ctx->D);
    (reinterpret_cast<sha1_uint32 *>( resbuf ))[4] = SWAP (ctx->E);
#else
    ((sha1_uint32 *) resbuf)[0] = SWAP (ctx->A);
    ((sha1_uint32 *) resbuf)[1] = SWAP (ctx->B);
    ((sha1_uint32 *) resbuf)[2] = SWAP (ctx->C);
    ((sha1_uint32 *) resbuf)[3] = SWAP (ctx->D);
    ((sha1_uint32 *) resbuf)[4] = SWAP (ctx->E);
#endif

  return resbuf;
}

/* Process the remaining bytes in the internal buffer and the usual
   prolog according to the standard and write the result to RESBUF.

   IMPORTANT: On some systems it is required that RESBUF is correctly
   aligned for a 32-bit value.  */
void *
sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
{
  /* Take yet unprocessed bytes into account.  */
  sha1_uint32 bytes = ctx->buflen;
  size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;

  /* Now count remaining bytes.  */
  ctx->total[0] += bytes;
  if (ctx->total[0] < bytes)
    ++ctx->total[1];

  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
  ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
  ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);

#ifdef __cplusplus
  memcpy (&(reinterpret_cast<char *>( ctx->buffer ))[bytes], fillbuf, (size - 2) * 4 - bytes);
#else
  memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
#endif

  /* Process last bytes.  */
  sha1_process_block (ctx->buffer, size * 4, ctx);

  return sha1_read_ctx (ctx, resbuf);
}

/* Compute SHA1 message digest for bytes read from STREAM.  The
   resulting message digest number will be written into the 16 bytes
   beginning at RESBLOCK.  */
int
sha1_stream (FILE *stream, void *resblock)
{
  struct sha1_ctx ctx;
  char buffer[BLOCKSIZE + 72];
  size_t sum;

  /* Initialize the computation context.  */
  sha1_init_ctx (&ctx);

  /* Iterate over full file contents.  */
  while (1)
    {
      /* We read the file in blocks of BLOCKSIZE bytes.  One call of the
     computation function processes the whole buffer so that with the
     next round of the loop another block can be read.  */
      size_t n;
      sum = 0;

      /* Read block.  Take care for partial reads.  */
      while (1)
    {
      n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);

      sum += n;

      if (sum == BLOCKSIZE)
        break;

      if (n == 0)
        {
          /* Check for the error flag IFF N == 0, so that we don't
         exit the loop after a partial read due to e.g., EAGAIN
         or EWOULDBLOCK.  */
          if (ferror (stream))
        return 1;
          goto process_partial_block;
        }

      /* We've read at least one byte, so ignore errors.  But always
         check for EOF, since feof may be true even though N > 0.
         Otherwise, we could end up calling fread after EOF.  */
      if (feof (stream))
        goto process_partial_block;
    }

      /* Process buffer with BLOCKSIZE bytes.  Note that
            BLOCKSIZE % 64 == 0
       */
      sha1_process_block (buffer, BLOCKSIZE, &ctx);
    }

 process_partial_block:;

  /* Process any remaining bytes.  */
  if (sum > 0)
    sha1_process_bytes (buffer, sum, &ctx);

  /* Construct result in desired memory.  */
  sha1_finish_ctx (&ctx, resblock);
  return 0;
}

/* Compute SHA1 message digest for LEN bytes beginning at BUFFER.  The
   result is always in little endian byte order, so that a byte-wise
   output yields to the wanted ASCII representation of the message
   digest.  */
void *
sha1_buffer (const char *buffer, size_t len, void *resblock)
{
  struct sha1_ctx ctx;

  /* Initialize the computation context.  */
  sha1_init_ctx (&ctx);

  /* Process whole buffer but last len % 64 bytes.  */
  sha1_process_bytes (buffer, len, &ctx);

  /* Put result in desired memory area.  */
  return sha1_finish_ctx (&ctx, resblock);
}

void
sha1_process_bytes (const void *buffer, size_t len, struct sha1_ctx *ctx)
{
    /* When we already have some bits in our internal buffer concatenate
       both inputs first.  */
    if (ctx->buflen != 0)
    {
        size_t left_over = ctx->buflen;
        size_t add = 128 - left_over > len ? len : 128 - left_over;
        
#ifdef __cplusplus
        memcpy (&(reinterpret_cast<char *>( ctx->buffer ))[left_over], buffer, add);
#else
        memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
#endif
        ctx->buflen += add;
        
        if (ctx->buflen > 64)
        {
#ifdef __cplusplus
            sha1_process_block (ctx->buffer, static_cast<size_t> (ctx->buflen & static_cast<sha1_uint32>( ~63 )), ctx);
#else
            sha1_process_block (ctx->buffer, (size_t) (ctx->buflen & (sha1_uint32) ~63), ctx);
#endif
            
            ctx->buflen &= 63;
            /* The regions in the following copy operation cannot overlap.  */
#ifdef __cplusplus
            memcpy (ctx->buffer,
                &(reinterpret_cast<char *>( ctx->buffer ))[(left_over + add) & static_cast<sha1_uint32>( ~63 )],
                ctx->buflen);
#else
            memcpy (ctx->buffer,
                &((char *) ctx->buffer)[(left_over + add) & (sha1_uint32) ~63],
                ctx->buflen);
#endif
        }
        
#ifdef __cplusplus
        buffer = reinterpret_cast<const char *>( buffer ) + add;
#else
        buffer = (const char *) buffer + add;
#endif
        len -= add;
    }
    
    /* Process available complete blocks.  */
    if (len >= 64)
    {
        
#ifndef __GLIBC__
#define _STRING_ARCH_unaligned 0
#endif
        
#if !_STRING_ARCH_unaligned
# define alignof(type) offsetof (struct offset_test, x)
#ifdef __cplusplus
# define UNALIGNED_P(p) ((reinterpret_cast<size_t>( const_cast<void *>( p ) )) % alignof (sha1_uint32) != 0)
#else
# define UNALIGNED_P(p) (((size_t) p) % alignof (sha1_uint32) != 0)
#endif
        if (UNALIGNED_P (buffer))
            while (len > 64)
                {
                sha1_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
        #ifdef __cplusplus
                buffer = reinterpret_cast<const char *>( buffer ) + 64;
        #else
                buffer = (const char *) buffer + 64;
        #endif
                len -= 64;
                }
        else
#endif
        {
#ifdef __cplusplus
            sha1_process_block (buffer, len & static_cast<sha1_uint32>( ~63 ), ctx);
            buffer = reinterpret_cast<const char *>( buffer ) + (len & static_cast<sha1_uint32>( ~63 ));
#else
            sha1_process_block (buffer, len & (sha1_uint32) ~63, ctx);
            buffer = (const char *) buffer + (len & (sha1_uint32) ~63);
#endif
            len &= 63;
        }
    }
    
    /* Move remaining bytes in internal buffer.  */
    if (len > 0)
    {
        size_t left_over = ctx->buflen;
        
#ifdef __cplusplus
        memcpy (&(reinterpret_cast<char *>( ctx->buffer ))[left_over], buffer, len);
#else
        memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
#endif
        left_over += len;
        if (left_over >= 64)
        {
            sha1_process_block (ctx->buffer, 64, ctx);
            left_over -= 64;
            memcpy (ctx->buffer, &ctx->buffer[16], left_over);
        }
#ifdef __cplusplus
        ctx->buflen = static_cast<sha1_uint32>( left_over );
#else
        ctx->buflen = (sha1_uint32) left_over;
#endif
    }
}

/* --- Code below is the primary difference between md5.c and sha1.c --- */

/* SHA1 round constants */
#define K1 0x5a827999
#define K2 0x6ed9eba1
#define K3 0x8f1bbcdc
#define K4 0xca62c1d6

/* Round functions.  Note that F2 is the same as F4.  */
#define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
#define F2(B,C,D) (B ^ C ^ D)
#define F3(B,C,D) ( ( B & C ) | ( D & ( B | C ) ) )
#define F4(B,C,D) (B ^ C ^ D)

/* Process LEN bytes of BUFFER, accumulating context into CTX.
   It is assumed that LEN % 64 == 0.
   Most of this code comes from GnuPG's cipher/sha1.c.  */

void
sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
{
#ifdef __cplusplus
    const sha1_uint32 *words = reinterpret_cast<const sha1_uint32 *>( buffer );
#else
    const sha1_uint32 *words = (const sha1_uint32 *) buffer;
#endif
    size_t nwords = len / sizeof (sha1_uint32);
    const sha1_uint32 *endp = words + nwords;
    sha1_uint32 x[16];
    sha1_uint32 a = ctx->A;
    sha1_uint32 b = ctx->B;
    sha1_uint32 c = ctx->C;
    sha1_uint32 d = ctx->D;
    sha1_uint32 e = ctx->E;

    /* First increment the byte count.  RFC 1321 specifies the possible
       length of the file up to 2^64 bits.  Here we only compute the
       number of bytes.  Do a double word increment.  */
    ctx->total[0] += len;
    if (ctx->total[0] < len)
    ++ctx->total[1];

#ifdef __cplusplus
#define rol(x, n) (((x) << (n)) | (static_cast<sha1_uint32>( x ) >> (32 - (n))))
#else
#define rol(x, n) (((x) << (n)) | ((sha1_uint32) (x) >> (32 - (n))))
#endif

#define M(I) ( tm =   x[I&0x0f] ^ x[(I-14)&0x0f]    \
           ^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f]        \
           , (x[I&0x0f] = rol(tm, 1)) )
    
#define R(A,B,C,D,E,F,K,M)  do { E += rol( A, 5 )    \
        + F( B, C, D )                \
        + K                        \
        + M;                    \
    B = rol( B, 30 );                \
    } while(0)
    
    while (words < endp)
    {
        sha1_uint32 tm;
        int t;
        for (t = 0; t < 16; t++)
        {
            x[t] = SWAP (*words);
            words++;
        }
        
        R( a, b, c, d, e, F1, K1, x[ 0] );
        R( e, a, b, c, d, F1, K1, x[ 1] );
        R( d, e, a, b, c, F1, K1, x[ 2] );
        R( c, d, e, a, b, F1, K1, x[ 3] );
        R( b, c, d, e, a, F1, K1, x[ 4] );
        R( a, b, c, d, e, F1, K1, x[ 5] );
        R( e, a, b, c, d, F1, K1, x[ 6] );
        R( d, e, a, b, c, F1, K1, x[ 7] );
        R( c, d, e, a, b, F1, K1, x[ 8] );
        R( b, c, d, e, a, F1, K1, x[ 9] );
        R( a, b, c, d, e, F1, K1, x[10] );
        R( e, a, b, c, d, F1, K1, x[11] );
        R( d, e, a, b, c, F1, K1, x[12] );
        R( c, d, e, a, b, F1, K1, x[13] );
        R( b, c, d, e, a, F1, K1, x[14] );
        R( a, b, c, d, e, F1, K1, x[15] );
        R( e, a, b, c, d, F1, K1, M(16) );
        R( d, e, a, b, c, F1, K1, M(17) );
        R( c, d, e, a, b, F1, K1, M(18) );
        R( b, c, d, e, a, F1, K1, M(19) );
        R( a, b, c, d, e, F2, K2, M(20) );
        R( e, a, b, c, d, F2, K2, M(21) );
        R( d, e, a, b, c, F2, K2, M(22) );
        R( c, d, e, a, b, F2, K2, M(23) );
        R( b, c, d, e, a, F2, K2, M(24) );
        R( a, b, c, d, e, F2, K2, M(25) );
        R( e, a, b, c, d, F2, K2, M(26) );
        R( d, e, a, b, c, F2, K2, M(27) );
        R( c, d, e, a, b, F2, K2, M(28) );
        R( b, c, d, e, a, F2, K2, M(29) );
        R( a, b, c, d, e, F2, K2, M(30) );
        R( e, a, b, c, d, F2, K2, M(31) );
        R( d, e, a, b, c, F2, K2, M(32) );
        R( c, d, e, a, b, F2, K2, M(33) );
        R( b, c, d, e, a, F2, K2, M(34) );
        R( a, b, c, d, e, F2, K2, M(35) );
        R( e, a, b, c, d, F2, K2, M(36) );
        R( d, e, a, b, c, F2, K2, M(37) );
        R( c, d, e, a, b, F2, K2, M(38) );
        R( b, c, d, e, a, F2, K2, M(39) );
        R( a, b, c, d, e, F3, K3, M(40) );
        R( e, a, b, c, d, F3, K3, M(41) );
        R( d, e, a, b, c, F3, K3, M(42) );
        R( c, d, e, a, b, F3, K3, M(43) );
        R( b, c, d, e, a, F3, K3, M(44) );
        R( a, b, c, d, e, F3, K3, M(45) );
        R( e, a, b, c, d, F3, K3, M(46) );
        R( d, e, a, b, c, F3, K3, M(47) );
        R( c, d, e, a, b, F3, K3, M(48) );
        R( b, c, d, e, a, F3, K3, M(49) );
        R( a, b, c, d, e, F3, K3, M(50) );
        R( e, a, b, c, d, F3, K3, M(51) );
        R( d, e, a, b, c, F3, K3, M(52) );
        R( c, d, e, a, b, F3, K3, M(53) );
        R( b, c, d, e, a, F3, K3, M(54) );
        R( a, b, c, d, e, F3, K3, M(55) );
        R( e, a, b, c, d, F3, K3, M(56) );
        R( d, e, a, b, c, F3, K3, M(57) );
        R( c, d, e, a, b, F3, K3, M(58) );
        R( b, c, d, e, a, F3, K3, M(59) );
        R( a, b, c, d, e, F4, K4, M(60) );
        R( e, a, b, c, d, F4, K4, M(61) );
        R( d, e, a, b, c, F4, K4, M(62) );
        R( c, d, e, a, b, F4, K4, M(63) );
        R( b, c, d, e, a, F4, K4, M(64) );
        R( a, b, c, d, e, F4, K4, M(65) );
        R( e, a, b, c, d, F4, K4, M(66) );
        R( d, e, a, b, c, F4, K4, M(67) );
        R( c, d, e, a, b, F4, K4, M(68) );
        R( b, c, d, e, a, F4, K4, M(69) );
        R( a, b, c, d, e, F4, K4, M(70) );
        R( e, a, b, c, d, F4, K4, M(71) );
        R( d, e, a, b, c, F4, K4, M(72) );
        R( c, d, e, a, b, F4, K4, M(73) );
        R( b, c, d, e, a, F4, K4, M(74) );
        R( a, b, c, d, e, F4, K4, M(75) );
        R( e, a, b, c, d, F4, K4, M(76) );
        R( d, e, a, b, c, F4, K4, M(77) );
        R( c, d, e, a, b, F4, K4, M(78) );
        R( b, c, d, e, a, F4, K4, M(79) );
        
        a = ctx->A += a;
        b = ctx->B += b;
        c = ctx->C += c;
        d = ctx->D += d;
        e = ctx->E += e;
    }
}

/* We want to digest in one go, so we run everything at once */
void 
STARCH_SHA1_All(const unsigned char *input, size_t inputLength, unsigned char *output)
{
#ifdef __cplusplus
    sha1_buffer(reinterpret_cast<const char *>( const_cast<unsigned char *>( input ) ), inputLength, output);
#else
    sha1_buffer((const char *)input, inputLength, output);
#endif
}

#ifdef __cplusplus
} // extern "C"
#endif
